Launching Qt Creator from the Visual Studio command prompt should not be necessary, as the known bug necessitating it is documented as having been fixed in the latest versions. In my experience, though, it is indeed still necessary.

If you get the 0xc000007b crash when you run your application on another computer, then you just need to distribute the 64-bit Qt DLLS (starting with QtGui4.dll and QtCore4.dll) with your app.